US3516492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater wellhead connector
Assignee: Shell USA Inc
•
Filing: 1968-05-23
•
Granted: 1970-06-23
•
Expires: 1988-05-23
Abstract
No abstract record available.
Inventors
- 👤 William H Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/038
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3071188A
Cited
US3052299A
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US3265130A
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US3217805A
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US3332484A
Cited
US3301322A
Cited
US3339632A
Cited
US3419071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |